You're watching America this morning -- America's number 1 in the early morning news. We begin without breaking story -- heard overnight at a major fireworks show thousands of people watching the professional display at the LA suburb of Simi Valley when something went wrong. The mood at the July 4 celebration turned from -- chaotic and a split second. A number of fireworks shells exploding just feet from the ground. The loud blast sending terrified people running for safety as many -- It's. Yeah. Block of -- about this big computing data and it hit it out of my leg -- we had bits and pieces of fireworks coming that is a big round cylinder block that the person sitting next to me emergency medical crews rushed to the scene treating nearly thirty people some victims suffering shrapnel wounds most suffering minor to moderate injuries his pieces of the fireworks rained down. As many as 101000 people were -- to show the malfunction happened just two minutes into the show. The platform holding those fireworks seems to have collapsed sending those shells into the crowd we'll have more on this story later on Good Morning America.

This transcript has been automatically generated and may not be 100% accurate.

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